KR0135062B1 - Method and device for hot air drying - Google Patents

Abstract

The to-be-dried product 5 is input into the stirring drum 6 of the rotating drum 3 which rotates from the inlet 34. FIG. Hot air from the blower 31 is blown through the air heater 30 to the intake duct 22 through the punching plate 32. The air flow rate adjusting means 25 is adjusted with the opening degree of each of the ventilation paths 24 and 24 of the intake duct 22 being a predetermined opening degree.

Hot air is blown from the opening 24a just under the axial direction of the rotating drum 3 to the rotating drum 3 in the lid 17 with a small amount of blowing along the openings 24a in both the axial directions. The hot air is blown from the lower side in the radial direction to the upper side in the rotary drum 3 through the air vent 2, and blows up the dry object 5 to flow in the vertical direction. The to-be-dried material 5 is dry-transported because the upper surface becomes substantially horizontal direction.

Hot air passes between the particles of the object to be dried 5, and can be dried in a short time with good efficiency regardless of the object to be dried 5.

Description

Hot air drying method and apparatus

1 is a cross-sectional view of a part showing one embodiment of a hot air drying apparatus of the present invention.

2 is a perspective view of a part of the above cut out

3 is a cross-sectional view of a part showing one embodiment of a conventional hot air drying apparatus.

4 is a perspective view of a part of the above cut out

5 is a cross-sectional view of a portion showing another embodiment of a conventional hot air drying apparatus.

6 is a perspective view of a part of the above cut out

* Explanation of symbols for main parts of the drawings

1: hot air dryer 2: aeration

3: rotating drum 4: receiving vehicle

5: dry building 6: stirring drum

7: Agitator 9: discharge control panel

10: observation hole 11: take-out hole

12: Take out adjustment plate 13: Revolving gear

14: power gear 16: heating section

17: cover body 18: exhaust vent

19: intake 21: exhaust duct

22: intake duct 23: wall

24: ventilation path 24a: opening

25: air volume control means 27: closed plate

28: shaft 29: hot air blower

30: Air heater 31: Blower

32: punching plate 34: inlet

35: Suit 36: outlet

37: outlet feed 41: hot air drying device

42: ventilation 43: transfer board

44: drying room 45: duct

46: Exhaust vent 47: Building

48: inlet 49: stirrer

50: outlet 51: lid body

61: hot air drying device 62: ventilator

63: rotating drum 64: stirring drum

65: heating chamber part 65a: first heating chamber

65b: Second heating chamber 66: Exhaust vent

67: air vent 68: dry building

69: Entrance 70: Suit

71: outlet 72: outlet feed

The present invention relates to a hot air drying method and an apparatus for drying a dry object stirred and transported by rotation by hot air.

Conventionally, as an apparatus for drying, for example, dice-shaped rice cakes, processed foods such as snacks, or inorganic materials such as chamotte with hot air, for example, the hot air drying apparatus 41 shown in FIGS. A drying chamber 44 constituting the bottom surface is formed by a plate-shaped transfer plate 43 through which numerous air holes 42 are opened, and hot air from a hot air blower not shown below the transfer plate 43 is formed. The duct 45 which blows into the drying chamber 44 through the ventilation hole 43 is provided. In addition, an exhaust port 46 for exhausting hot air blown into the drying chamber 44 is formed above the drying chamber 44.

In addition, an inlet port 48 for injecting the to-be-dried product 47 is formed at an upstream side of the drying chamber 44, and the to-be-dried product 47 introduced into the drying chamber 44 below the inlet port 48 is stirred. A stirring device 49 is provided. Further, a downstream outlet 50 of the drying chamber 44 is provided with a discharge port 50 through which the dried object 47 is discharged, and a lid 51 is provided in the discharge port 50 so as to enable vertical movement.

And in drying the to-be-dried 47, a hot air blower is first driven, and hot air is blown into the drying chamber 44 through the duct 45. FIG. Next, the agitator 49 is driven to inject the dry matter 47 from the inlet 48. And the to-be-dried object 47 is called up by hot air, and spreads, while moving up and down on the conveyance plate 43. FIG. In addition, the to-be-dried product 47 dried by hot air and transferred to the discharge port 50 is discharged out of the hot air drying apparatus 41 from the discharge port 50 adjusted to an appropriate opening degree as the lid 51.

In addition, the drying time and the drying amount per hour are performed by adjusting the opening degree of the discharge port 50 as the lid 51.

However, in the conventional hot air drying apparatus 41 shown in FIGS. 3 and 4, the dry object 47 is blown up by hot air and transported while moving up and down on the transfer plate 43. If it is about 0.3-4 mm and the to-be-dried object 47 with a grain shape has a problem, it cannot be made to dry uniformly.

Therefore, as a hot air drying apparatus capable of uniformly drying even if the diameter of the magnetic field is not uniform, those having the structures shown in FIGS. 5 and 6 are known.

The hot air drying apparatus 61 of the structure shown in FIGS. 5 and 6 has a cylindrical rotating drum 63 in which a plurality of round holes vents 62 are drilled in the circumferential surface of which both ends are opened in the horizontal direction. It is slightly inclined so as to be rotatably supported by a driving means such as a motor. Moreover, in the rotating drum 63, both ends are opened, and the tubular stirring drum 64 of the wave shape is provided inside in the axial direction so that it can ventilate.

The hot air drying device 61 includes a rotating drum 63, and a heating chamber portion 65 having a columnar shape is provided. The heating chamber 65 is partitioned into a first heating chamber 65a at one end upstream of the rotary drum 63 and a second heating chamber 65b at the downstream end of the rotary drum 63, and each heating chamber 65a, ( In the upper surface, the exhaust ports 66 and 66 are opened in the upper surface thereof, and the air vents 67 and 67 are formed in the lower surface thereof. And each blower 67 and 67 is equipped with the blower through the air heater not shown.

In addition, a chute 70 having an inlet 69 into which an upper portion of the rotary drum 63 is opened toward the upper end to close the opening of the rotary drum 63 and into which the object to be dried 68 is introduced is provided. Inlet feed is provided. In addition, an outlet feed 72 having an outlet 71 for discharging the dried object 68 to be discharged at the lower end is provided at the downstream end of the rotary drum 63 to close the opening of the rotary drum 63. It is.

In the drying of the object 68, the rotary drum 63 is first rotated, and a blower is driven to blow hot air from the blower port 67 into the heating chamber 65 as an air heater to heat the heating chamber 65. I heat up the inside. Next, the object to be dried is introduced into the rotating drum 63 from the inlet 69 of the chute 70. And the to-be-dried thing 68 is dried by the hot air which flows in through the vent hole 62 into the rotating drum 63, and is conveyed by stirring as the stirring drum 64, from the discharge port 71 of the outlet feed 72. Discharged.

By the way, in the conventional hot air drying apparatus 61 shown in FIG. 5 and FIG. 6, when the to-be-dried object 68 is dried, the to-be-processed object 68 is made in the rotating drum 63 which rotates. As shown in FIG. 5, since the upper surface is inclined and conveyed in a semi-circular rotation shape, when the ratio of the object 68 to the cross-sectional area of the rotating drum 63 is increased, Since the thickness becomes thick and the dry state becomes uneven, the dry amount of the object to be dried 68 is limited.

On the other hand, in order to maintain a good drying state and increase the amount of drying, the dimension in the radial direction and the length in the axial direction of the rotating drum 63 must be lengthened, which causes a problem that the hot air drying device 61 is enlarged.

In view of the above problems, an object of the present invention is to provide a hot air drying method and apparatus capable of drying efficiently and satisfactorily as a compact apparatus regardless of the state of a dry matter.

The hot air drying method according to claim 1 has a plurality of vent holes on an outer circumferential surface thereof, and a cylindrical rotating drum in which a dry object is accommodated rotates about a central axis, and faces upward from a lower side of the rotating drum. In the hot air drying method for blowing hot air through the vent hole, a plurality of air passages for allowing hot air to be blown from the lower side of the drum toward the upper side is formed in a plurality of partitions, the dry drum of the rotating drum The central position immediately below the axial direction is the strongest in the blow air volume through the blower, and the blow volume through the blower toward the both sides of the axial direction in which the building is thin in the central position just below the axial direction.

In particular, the hot-air drying apparatus according to claim 2 includes a cylindrical rotating drum in which a plurality of vent holes are formed on an outer circumferential surface thereof, and a dry matter is accommodated, drive means for rotating the rotating drum about a central axis; A hot air drying apparatus provided at a lower side of a rotating drum and having hot air blowing means for blowing hot air from the lower side of the rotating drum, wherein the hot air blowing means includes a hot air blower and a hot air blower at one end thereof. And a duct having an opening at the other end under the rotary drum in a plurality of sections along the axial direction of the rotary drum, and openings corresponding to the respective openings, and for controlling the air volume from the hot air blower. It is equipped with a means.

The hot air drying method according to claim 1 is the outermost surface from the bottom side upward from the bottom in the rotating drum so that the blowing amount of the hot air is counted directly under the axial direction of the rotating drum to be rotated and decreases toward both sides of the axial direction. Since the hot air is blown through a plurality of vents, the air flows directly below the thickest axial direction, and the air flows up and down uniformly throughout the entire area because the air flow is small at the periphery where the water is thin. Simultaneously with rotational stirring, any to be dried is favorably dried, while the amount of drying is increased, and the drying efficiency is improved.

The hot air drying apparatus according to claim 2 is an air volume adjusting means provided in openings divided into a plurality of sections along the axial direction of the rotating drum. The hot air drying apparatus drives the hot air from the hot air blower by suitably varying the air volume of each opening. Since the air is blown from the lower side through the openings of the duct through the openings of the rotating drum rotated by the means, the rotating drum is rotated uniformly up and down simultaneously while being rotated uniformly throughout the entire structure, so that any dried object is satisfactory. At the same time as drying, the drying amount is increased and the drying efficiency is improved.

EXAMPLE

EMBODIMENT OF THE INVENTION Hereinafter, the structure of one Example of the hot air drying apparatus of this invention is demonstrated with reference to drawings.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a hot air dryer, which is a cylindrical rotation in which a plurality of round holes vent holes 2 are drilled in a peripheral surface of which both ends are opened. The drum 3 is freely supported for rotation by the four receiving wheels provided in the vicinity of both ends of the rotary drum 3, and the upstream side in the longitudinal direction in which the dry object 5 is fed. It is slightly inclined from the horizontal direction to be located above.

In addition, both ends of the rotating drum 3 are opened, and a cylindrical stirring drum 6 is provided inside the mesh so as to fit the inner circumferential surface of the rotating drum 3 so as to allow ventilation. On the inner circumferential surface of the rotating drum 3, a plurality of agitators 7 protruding in a circumferential shape toward the center are provided.

At the downstream end of the rotary drum 3, there is provided a discharge adjusting plate 9 for discharging the dried product to close the opening. The discharge adjusting plate 9 has a circular observation hole 10 formed in the center thereof, and the inside of the rotating drum 3 can be observed. Moreover, the ejection hole 11 is formed in the periphery of the discharge adjustment plate 9, respectively, and orthogonally, and these ejection hole 11 is made to slide by drive means, such as a motor which is not shown in figure. The ejection adjustment plate 12 is attached, and the opening degree of the ejection hole 11 can be adjusted.

The rotary bearing gear 13 is formed on the outer circumferential surface near the both ends of the rotary drum 3. The rotary gear 13 is meshed with a power gear 14 as a driving means rotated by a drive such as a motor (not shown), and the rotary drum 3 is rotated by the power gear 14. Is rotated through).

The hot air dryer 1 has a columnar heating chamber portion so as to contain the rotary drum 3 between the upstream and downstream receiving drums 4 and 4 of the rotary drum 3. (16) is provided. Moreover, in this heating chamber part 16, the substantially cylindrical cover body 17 which contains the rotating drum 3 is provided so that the rotation of the rotating drum 3 may not be disturbed.

In addition, an exhaust port 18 is formed in the upper surface of the lid body 17, and an inlet port 19 is formed in the lower surface of the cover body 17 facing the exhaust port 18 via the rotary drum 3 therebetween.

The exhaust port 18 of the lid 17 is provided with an exhaust duct 21 projecting upward through the upper surface of the heating chamber 16. An exhaust fan (not shown) is attached to the upper end side of the exhaust duct 21 and communicates with an exhaust tower that processes and exhausts exhaust gas from the exhaust fan.

The intake port 19 is provided with an intake duct 22 which penetrates the bottom surface of the heating chamber 16 and projects downward. In addition, a plurality of walls 23 are provided in the intake duct 22 along the axial direction of the rotating drum 3, and the air passages are provided along the axial direction of the rotating drum 3 by these walls 23. A plurality of sections 34 are formed, and the opening 24a is formed at the front end corresponding to the sections. In addition, the air volume adjusting means 25, 25 is provided in the vicinity of the lower end of each ventilation path 24, 24, respectively.

And this air volume control means 25 is formed in the circumferential shaft part which rotates by the motor etc. which are not shown in the center of the longitudinal direction of the flat closing plate 27 at the edge part of the ventilation path 24 ( 28 is integrally provided, and both ends of the shaft portion 28 are axially supported in the air passage 24 so that the opening degree of the air passage 24 is variable by the closing plate 27, respectively.

In addition, hot air blowers 29 are attached to the lower ends of the intake ducts 22 and 22, respectively. The hot air blower 29 is constituted by blowers 31 and 31 provided with an air filter (not shown) via the air heaters 30 and 30. In addition, a punching plate 32 having a plurality of round holes is provided between the air heaters 30 and 30 and the airflow control means 25 and 25 so as to close the lower end of the intake duct 22. The amount of hot air from the blower 31 is substantially uniform with respect to the cross section of the duct 22 via the air heater 30.

Then, the hot air from the blower 31 via the air heater 30 passes along the openings 24a in both the axial directions from just below the axial direction of the rotary drum 3 via the intake duct 22. The opening degree of the air volume adjusting means 25 is set so that the amount of hot air decreases along the air passage 24 located outward from the air passage 24 which is opened to face the lower end of the rotary drum 3. .

Further, an inlet feed (not shown) is provided at one end upstream of the heating chamber part 16 to close the opening upstream of the rotating drum 3.

Then, the inlet feed is opened toward the upper side at the upper end, an inlet 34 through which the object 5 is introduced is formed in an opening, and at the lower end, a tubular projecting into the stirring drum 6 in the rotating drum 3 is formed. The chute 35 is installed.

Further, on the downstream side of the other end of the heating chamber part 16, an outlet feed for opening the outlet 36 through which the dried object 5 dried at the lower end is discharged, as if the opening on the downstream side of the rotary drum 3 is closed. (37) is provided.

Moreover, the exit feed 37 is provided with the observation hole which is not shown in figure which opposes the observation hole 10 of the discharge control plate 9 of the rotating drum 3, and observes the inside of the rotating drum 3 through this observation hole 10. FIG. It is possible.

In addition, the inlet feed and the outlet feed 37 are arranged so as not to interfere with the rotation of the rotary drum 3.

Next, the operation of the above embodiment will be described.

First, each of the blowers and blowers 31 and 31 is driven to heat the air sucked through an air filter (not shown) to each of the air heaters 30 and 30, and the hot air is punched into the punching plate 32. Blowing through the intake duct (22). On the other hand, each air volume control means 25, 25 is adjusted so that the opening degree of each ventilation path 24, 24 of the intake duct 22 may be predetermined opening degree.

The hot air blown through the intake duct 22 is blown through the intake duct 22 to the heating chamber 16 of the hot air drying apparatus 1.

Then, the rotary receiving gear 13 is rotated by the power gear 14 which rotates the dried object 5 from the inlet 34 of the outlet chute 37 of the hot air drying apparatus 1 to the motor or the like through the inlet feed. It enters into the stirring drum 6 of the rotating drum 3 which rotates through it.

In addition, the drying conditions are the hot air temperature, the hot air amount by the degree of opening of the air volume control means 25, 25, and the ejection hole of the discharge adjusting plate 9, depending on the composition of the object to be dried 5 or the shape. 11) The discharge rate of the building 5 according to the opening degree is appropriately changed.

In addition, the hot air is blown by the air volume adjusting means 25, 25 so as to reduce the amount of air blown along both sides of the axial direction from immediately below the axial direction of the rotary drum 3, respectively. And 24 are blown through the openings 24a and 24a from the inlet port 19 to the rotary drum 3 in the lid 17. In addition, the blowing state of hot air is blown so that the to-be-dried object 5 may not be rapidly dried on the surface, for example, the upstream side in the stirring drum 6 of the rotating drum 3 may become a little lower than the downstream side.

In addition, the hot air is blown upwards from the lower side in the radial direction of the rotating drum (3) in the rotating drum (3) through the vent (2), (2), and again through the vent (2), (2) The exhaust port 18 is exhausted through the exhaust duct 21.

And the to-be-dried object 5 is called up in the rotating drum 3 by the blowing of hot air, and moves to an up-down direction, and rotates, stirring by the stirrer 7 by the rotation of the rotating drum 3. As shown in FIG. In addition, the air volume adjusting means 25 so that the amount of hot air flows along the opening 24a of the air blowing passage 24 located outside from the opening 24a of the air blowing passage 24 facing the lower end of the rotating drum 3. Since the opening degree of (25) is set, it transfers dry so that the upper surface of the to-be-constructed object 5 may become substantially horizontal direction in the rotating drum 3 as shown in FIG.

For this reason, hot air passes between the particles of the dry object 5, and the dry object 5 can be efficiently dried in a short time. Moreover, even when the to-be-dried material 5 which differs in particle diameter and shape is called up by hot air, it can dry reliably, without a dry stain, and can use it widely, regardless of the state of the to-be-dried object 5.

In addition, the to-be-dried object 5 which was dry-dried to the downstream of the rotating drum 3 is discharged as a dry thing through the discharge port 36 of the outlet feed 37 from the ejection hole 11 with the opening degree adjusted suitably.

Therefore, according to the above embodiment, the blowing amount of the hot air via the air heaters 30 and 30 by the blower is directly below the opening in the axial direction of the rotating drum 3 rotated by the power gear 14 ( Since the hot air is blown through a plurality of vent holes 2 perforated on the outer circumferential surface of the rotating drum 3 from the bottom side to the upper side so as to decrease along the openings 24a in both axial directions from 24a), the object to be dried 5 is vertically Since it flows in a furnace and rotates at the same time, drying can be performed satisfactorily, and the drying amount can be increased, and the hot air drying apparatus 1 can be miniaturized.

Moreover, since the to-be-dried object 5 is made to flow up and down, it can prevent that the to-be-dried object 5 rubs | rotates by rotational conveyance like the conventional one, and the fall of the production yield by the damage of the to-be-dried object 5 is prevented You can prevent it.

In addition, since hot air is blown from the lower side to the upper side and flows up and down, it is possible to prevent the dried object 5 from closing the vent hole 2 during the rotary stirring as in the prior art, thereby improving the drying efficiency. . In addition, since the cover 17 of the rotating drum 3 is covered, all the hot air can pass through the inside of the rotating drum 3 to improve drying efficiency, and to dry well in a short time, and a hot air drying apparatus. (1) can be miniaturized.

In addition, only the adjustment of the opening degree of the air flow rate adjusting means 25, 25 allows any of the dry items 5 to flow up and down, thereby improving utilization.

In addition, in the said Example, the stirrer 7 is not limited to a rod shape, What is provided in the wall form, What is formed in the wave form, etc. by the stirring drum 6 is also possible.

In addition, the discharge amount of the dry matter may be set according to the inclination and the rotational speed of the rotating drum 3 without providing the discharge adjusting plate 9.

Hot air drying method according to the present invention, through the air from the bottom to the top through the inside of the rotating drum so that the blowing amount of the hot air is hardest in the axial direction of the rotary drum to be rotated to the nearest and less toward both sides of the axial direction Due to the blowing of hot air, the air volume is largely below the thickest axial direction of the object, and the air volume is small at the thin cast part, so that the object rotates and stirs up and down simultaneously evenly throughout the entire body. The dried material can be dried satisfactorily and the amount of drying can be increased.

In addition, the hot air drying apparatus according to the present invention, through the plurality of openings along the axial direction of the rotating drum, the air volume of each opening is appropriately varied as the air volume adjusting means, and the hot air from the hot air blower is lowered to the vent of the rotating drum. Since the air is blown out of the drum, any dried material can be satisfactorily dried and the amount of drying can be increased by simultaneously rotating the to-be-dried object of the rotating drum up and down uniformly and simultaneously.

Claims (2)

It has a plurality of vent holes (2) on the outer circumferential surface, the cylindrical rotating drum (3) in which the object to be accommodated rotates about a central axis, the vent hole (2) from the bottom of the rotary drum (3) upwards In the hot air drying method for blowing hot air through the), A plurality of air passages 24 are formed in a plurality of compartments so that hot air is blown from the lower side to the upper side of the rotary drum 3, and a central position immediately below the axial direction of the rotary drum in which the object to be dried is the thickest part is blown. The hot air drying method characterized in that the air blowing through the furnace to the strongest, and the air flow through the air blower to reduce the amount of air blown through the blast furnace toward the axial side, which is the thin part of the object in the central position just below the axial direction. A plurality of vent holes (2) are formed on the outer circumferential surface, a cylindrical rotating drum (3) in which the object is to be accommodated, drive means for rotating the rotating drum (3) about a central axis, and a lower side of the rotating drum In the hot air drying apparatus provided with a hot air blowing means for blowing hot air to the rotary drum from below, the hot air blowing means comprises a hot air blower (29) and the hot air blower (29) at one end thereof. A duct 22 provided with an opening 24a, the other end of which is divided into a plurality of sections below the rotary drum 3 along the axial direction of the rotary drum 3, and corresponding to the respective openings. And a wind volume control means (25) capable of varying the volume of air from the hot air blower.